+
+ <subsection name="B">Stage "B"</subsection>
+ <news class="beta" date="2018 November 1.">
+ Extended (λδ-2) and restricted (λδ-1) type rules justified.
+ </news>
+ <news class="alpha" date="2018 September 21.">
+ λδ-2A completed with
+ confluence of rt-computation and
+ preservation of validity for rt-computation.
+ </news>
+ <news class="alpha" date="2018 June 8.">
+ Behavioral component rt_computation completed.
+ </news>
+ <news class="alpha" date="2018 April 16.">
+ "Big tree" theorem
+ (anniversary milestone).
+ </news>
+ <news class="alpha" date="2018 March 9.">
+ Support for rt-computation completed.
+ </news>
+ <news class="alpha" date="2017 October 17.">
+ Exclusion binder in local environments.
+ Syntactic component updated:
+ syntax, relocation, s_transition, s_computation, static, i_static.
+ </news>
+ <news class="alpha" date="2017 April 16.">
+ Strong rt-normalization
+ for simply typed terms
+ (anniversary milestone).
+ </news>
+ <news class="alpha" date="2017 March 16.">
+ Behavioral component rt_transition completed.
+ </news>
+ <news class="alpha" date="2017 February 19.">
+ Generic candidates of reducibility.
+ </news>
+ <news class="alpha" date="2017 January 17.">
+ Confluence for parallel r-transition on referred entries of local environments.